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Releases any cached interfaces on the upstream pin.
HRESULT ForceRefresh( );
Return Values
Returns S_OK.
Remarks
For efficiency, the CPosPassThruclass can cache the IMediaPositioninterface of the connected upstream output pin. This method releases any cached interface pointers and forces them to be obtained again via QueryInterfaceif needed.
Presently, this class does not cache the upstream IMediaPositionso this member function is not necessary. It is left in for future flexibility.